Malicious PDF — malware analysis report

Static analysis result for SHA-256 8048cf2eb50032ad…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 01:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1ee65e382ae875a38ff45545bdc7fae SHA-1: 0d1c574fe440a135b0b9bba353620f6b0d09ab9b SHA-256: 8048cf2eb50032addd5409aa475444ff9caa18761acf8f6030e694639fd080e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kelt.pl/userfiles/file/16369323669.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99d6812d80---sulis.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/vilazovi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c292dc25eab9909a3e1dc4e132014708/84021686299.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/sazuteves.pdfIn PDF document text
    • http://anpo.vn/upload/files/59474939731.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fjnk89bhor9e5vo8ummr3jiru6/34476302203.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4jo5buerltck92ok8m21ahaa35/jovulag.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f37ff6d8049c65663463a49503fc984e/polidobukujirulozokumi.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ziligolum.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///16573849364.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/50296045787.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210628064353835.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c42b22d0f7e111029d50133229132b60/96507713067.pdfIn PDF document text
    • https://yuss.it/file/58175188313.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/41520082565.pdfIn PDF document text
    • https://tangentemag.com/img/file/dotudezalupat.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/56748074281.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5fbd39d734cd83fe3f745a60dd7bb33f/99491344945.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/zijepoxatagabugeb.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f977b935ed---zepuruzejevakenubudi.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/59992939767.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609485cf520e8---80021932549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is+hydrogen+an+element+compound+or+mixturePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 11228 bytes
SHA-256: 97d96a896f7eff6ee30980a48fc2a967ff64d36265ccec472e9c40b38242ac15
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 17304 bytes
SHA-256: 69769ad54834bc139fbf0024e4b8e608f0033c756773628dcd100bc76d9ed384
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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